* What steps will reproduce the problem?

1. Create a set of Haskell files that have circular dependencies.
2. Load them using Scion (I tried using the emacs server)

* What is the expected output? What do you see instead?

I'd expect an error message, but nothing appears to happen. You have to look at the server output to see the message. I'd say this is really a bug in the GHC API, but a temporary workaround should be possible.